Can governments increase tax compliance by rewarding honest taxpayers? We conducted a controlled laboratory experiment comparing tax compliance under a “deterrence” baseline with tax compliance under two “reward” treatments: a “donation” treatment giving taxpayers a say in the spending purposes of their payments and a “lucky” treatment giving taxpayers the (highly unlikely) chance of winning a lottery. The reward treatments significantly affected tax behaviour but not in a straightforward manner. Although female participants altered their behaviour as expected and complied somewhat more, men strongly reacted in the opposite manner: they evaded a much higher percentage of taxes than under the baseline. Apparently, there is no one-size-fits-all approach to boost tax compliance.